Crazy Noise From Under The Hood!!!
 

I have got a sort of grinding, metalic sound coming form under my hood. It has to do with something that runs on the belt, becasue when I take the belt off I don't hear it. I have changed the water pump and the alternator and it is still making the noise. I would appericate any help you guys can offer. I have a AC, power steering, and power brakes.

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89' 5.0 GT Convertible Mustang and a 69' Mustang Mach 1 Fastback. If you want to know the rest, buy the rights.
AOL name: Woodnutz351

This will sound funny, but the best way to isolate a noise coming from an engine is to take a sold stick or metal pole about 2 or 3 feet long and touch one end to each component and the other to your ear... sounds weird and looks even weirder, but it helps in isolating noises. You hear exactly what's going on with the interior of that component. Just be very careful with moving parts when you do this. try it, you'll like it!! http://www.mustangworks.com/msgboard/smile.gif

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Joe! 1988 GT, 167,000 miles!!! 13.58@105mph Check out my listing! Click here! Or my website:
www.joe4speed.com
99 Ninja ZX-6R
10.32@135mph!
1993 Olds Eighty Eight LSS 16.40@88.8mph

Probaly the smog pump, it may have locked up, but not sure, never had it happen, knock on wood:\

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90 lx coupe: 175k miles, steeda water pump pully, hurst shifter, Mac cold air fenderwell, accel supercoil, ADS chip, aluminum D/S, Black magic fan, 3.27grs.
Best time: 13.9116(on 225/60/15 firehawks)
Best mph: 98.17
Best 60': 1.9607

next mods: subframes, mac h-pipe

when my smog pump locked up, it snapped the belt almost immediately! http://www.mustangworks.com/msgboard/mad.gif

Check your idler pulley. Check to see if it has any play. Mine went bad and squeled like a pig before it locked up.

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Mike Wigton
89 LX 351W
64 1/2 Convertible

I tried the metal stick thing, but I used a doctors stephascope. It sounds to me like it is coming form the air pump below the alternator.

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89' 5.0 GT Convertible Mustang and a 69' Mustang Mach 1 Fastback. If you want to know the rest, buy the rights.
AOL name: Woodnutz351

Yank that sucker off of there http://www.mustangworks.com/msgboard/biggrin.gif

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Too much to list. Best ET on the car so far with stock 2.73 gears - 13.73@102mph

Indiana Stangers Association
Buy your parts here
ICQ# 42269241

This is an old topic, but i would like to bring this back because this is a relating thread, to my current problem.

should i just pull the belt and see if noise stops?

I guess i didnt knock on wood http://www.mustangworks.com/msgboard/frown.gif what a coincedence.
but hope thats all it is.